What is the best way to clean old equippment.
 

What is the best way to clean old equippment safely? Like skimmers power heads and so on.

Vinegar.

Try this
 

Vinegar and water always works well.

What tip and how mutch?

just regular white vinegar. I usually use between a 25% and 50% solution depending on how fast I want it to work and how much gunk there is to be removed. Leave it in the solution for a few hours or overnight for heavy buildup.

I just buy the biggest jug at the store, and use it 100%...maybe 75% if I need a bit more volume. I dump it into a 2 gallon pail, and throw all the equipment in the bucket over night. If I have more stuff then will fit it the bucket I just do it again the next day reusing the same vinegar.

I used to dilute white vinegar but nowadays I don't mess around with that and use 100% strength - it's dirt cheap and you can reuse it.

For the truly impatient there's muriatic acid but that can be quite dangerous and requires special handling precautions.

Muriatic acid isn't so dangerous... Gloves, safety glasses and some due care and attention are about all you need when handling the full strength stuff...

1/4 cup into a gallon of water does a REALLY good job at cleaning up the calcium/coraline quickly.

I used to use pure vinegar all the time - got a little pricey, now I just use small amounts of muriatic acid - and get the job done way cheaper/faster.

Where would you get Muriatic acid? I have and old skimmer Viniger is not cutting it.

Hardware store